v1.3 Release Scoping: Features Graduating to Standard

[robscott]

This discussion is similar to #3403, but somewhat simpler. We'll track every GEP that could potentially graduate to standard in this release, and then look for owners to volunteer to drive them forward. Each top level comment will describe a GEP + what is required to take it to standard. To volunteer as a lead for that GEP, please add a comment in the thread below the GEP description.

As a reminder, each GEP that graduates to standard creates a new slot for a GEP to graduate from experimental (#3403), so if you really want a new experimental feature, volunteering to lead an experimental feature to standard will help.

Note that inclusion in the list below is not a guarantee that a GEP will graduate in v1.3, just an acknowledgement that it theoretically could with sufficient effort and consensus.